A process for producing a 5-fluorobenzoic acid of the formula (V), which comprises trichloromethylating a fluorobenzene of the formula (I) to obtain a 5-fluorobenzotrichloride of the formula (II), then reacting it with aqueous ammonia to obtain a 5-fluorobenzonitrile of the formula (III), reacting it with a fluorinating agent to obtain a 5-fluorobenzonitrile of the formula (IV) and hydrolyzing it:
wherein each of X₁ , X₃, Y₁ and Y₃ is a halogen atom, and each of X₂ and Y₂ is hydrogen or a halogen atom.
一种生产式(V)的5-
氟苯甲酸的工艺,包括将式(I)的
氟苯三
氯甲基化,得到式(II)的5-
氟三
氯甲苯,然后与
水氨反应,得到式(III)的5-
氟苯腈,再与
氟化剂反应,得到式(IV)的5-
氟苯腈,并将其
水解:
其中 X₁、X₃、Y₁ 和 Y₃ 各为卤原子,X₂ 和 Y₂ 各为氢或卤原子。